U.S. patent number 10,261,293 [Application Number 14/695,536] was granted by the patent office on 2019-04-16 for zoom lens having a high zoom ratio and high performance over an entire zoom range and image pickup apparatus including the same.
This patent grant is currently assigned to CANON KABUSHIKI KAISHA. The grantee listed for this patent is CANON KABUSHIKI KAISHA. Invention is credited to Yotaro Sanjo.
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United States Patent |
10,261,293 |
Sanjo |
April 16, 2019 |
Zoom lens having a high zoom ratio and high performance over an
entire zoom range and image pickup apparatus including the same
Abstract
Provided is a zoom lens, including, in order from an object side
to an image side: a first lens unit having a positive refractive
power that does not move for zooming; a second lens unit having a
negative refractive power that moves during zooming; at least one
lens unit that moves during zooming; and a rear lens unit including
an aperture stop, in which a focal length of the zoom lens at a
wide angle end, a focal length of the first lens unit, a focal
length of the second lens unit, and a half angle of field of the
zoom lens at the wide angle end are appropriately set.
Inventors: |
Sanjo; Yotaro (Utsunomiya,
JP) |
Applicant: |
Name |
City |
State |
Country |
Type |
CANON KABUSHIKI KAISHA |
Tokyo |
N/A |
JP |
|
|
Assignee: |
CANON KABUSHIKI KAISHA (Tokyo,
JP)
|
Family
ID: |
54355147 |
Appl.
No.: |
14/695,536 |
Filed: |
April 24, 2015 |
Prior Publication Data
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|
|
Document
Identifier |
Publication Date |
|
US 20150316756 A1 |
Nov 5, 2015 |
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Foreign Application Priority Data
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|
|
|
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May 1, 2014 [JP] |
|
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2014-094611 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
G02B
27/0025 (20130101); G02B 15/173 (20130101); G02B
15/20 (20130101) |
Current International
Class: |
G02B
27/00 (20060101); G02B 15/173 (20060101); G02B
15/20 (20060101) |
Field of
Search: |
;359/689,691,687,688,690,692,793,794,795,796 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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|
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|
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H07-325252 |
|
Dec 1995 |
|
JP |
|
H10-161026 |
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Jun 1998 |
|
JP |
|
H11-160620 |
|
Jun 1999 |
|
JP |
|
2011-81065 |
|
Apr 2011 |
|
JP |
|
2011-175185 |
|
Sep 2011 |
|
JP |
|
2012-150248 |
|
Aug 2012 |
|
JP |
|
Other References
Japanese office action issued in corresponding application No.
2014094611 dated Jan. 11, 2018, with translation, 9 pages. cited by
applicant.
|
Primary Examiner: Alexander; William R
Assistant Examiner: Duong; Henry A
Attorney, Agent or Firm: Carter, DeLuca & Farrell,
LLP
Claims
What is claimed is:
1. A zoom lens comprising in order from an object side to an image
side: a first lens unit having a positive refractive power and
configured not to move for zooming; a second lens unit having a
negative refractive power and configured to move for zooming; at
least one lens unit configured to move for zooming; and a rear lens
unit including an aperture stop, wherein an interval of each pair
of adjacent lens units of the first lens unit, the second lens
unit, the at least one lens unit and the rear lens unit is changed
for zooming, and wherein the zoom lens satisfies expressions
-12.00<f1/f2<-4.00;
-0.99<f2/(2.times.fW.times.tan(.omega._W))<-0.30; and
-0.05<f2/L2W<-0.05, where fW represents a focal length of the
zoom lens at a wide angle end, f1 represents a focal length of the
first lens unit, f2 represents a focal length of the second lens
unit, .omega._W represents a half angle of field of the zoom lens
al the wide angle end, and L2W represents an interval on an optical
axis between a surface, closest to the image side, of the second
lens unit and a surface, closest to the object side, of the at
least one lens unit at the wide angle end.
2. A zoom lens according to claim 1, wherein the zoom lens
satisfies an expression 9.00<.beta.2T/.beta.2W<35.00, where
.beta.2W represents a lateral magnification of the second lens unit
at the wide angle end and at infinity in an object distance, and
.beta.2T represents a lateral magnification of the second lens unit
at a telephoto end and at infinity in the object distance.
3. A zoom lens according to claim 1, wherein the zoom lens
satisfies an expression
4.00<LF/(2.times.fW.times.tan(.omega._W))<20.00, where LF
represents a distance on an optical axis from a surface, closest to
the object side, of the first lens unit to the aperture stop.
4. A zoom lens according to claim 1, wherein the zoom lens
satisfies an expression
10.00<fT/(2.times.fW.times.tan(.omega._W))<40.00, where fT
represents a focal length of the zoom lens at a telephoto end.
5. A zoom lens according to claim 1, wherein the aperture stop does
not move for zooming.
6. An image pickup apparatus, comprising: a zoom lens comprising,
in order from an object side to an image side: a first lens unit
having a positive refractive power and configured not to move for
zooming; a second lens unit having a negative refractive power and
configured to move for zooming; at least one lens unit configured
to move for zooming; and a rear lens unit including an aperture
stop, wherein an interval of each pair of adjacent lens units of
the first lens unit, the second lens unit, the at least one lens
unit and the rear lens unit is changed for zooming, and wherein the
zoom lens satisfies expressions -12.00<f1/f2<-4.00;
-0.99<f2/(2.times.fW.times.tan(.omega._W))<-0.30; and
-0.50<f2/L2W<-0.05, where fW represents a focal length of the
zoom lens at a wide angle end, f1 represents a focal length of the
first lens unit, f2 represents a focal length of the second lens
unit, .omega._W represents a half angle of field of the zoom lens
at the wide angle end, and L2W represents an interval on an optical
axis between a surface, closest to the image side, of the second
lens unit and a surface, closest to the object side, of the at
least one lens unit at the wide angle end; and an image pickup
element configured to receive an image formed by the zoom lens.
7. A zoom lens according to claim 1, wherein the zoom lens performs
focusing with a lens unit which is disposed on an object side of
the aperture stop.
8. A zoom lens according to claim 1, wherein the zoom lens
satisfies an expression 2.00<fT/f1<8.00, where fT represents
a focal length of the zoom lens at a telephoto end.
9. A zoom lens according to claim 1, wherein the zoom lens
satisfies an expression 2.39.ltoreq.fT/f1<8.00, where fT
represents a focal length of the zoom lens at a telephoto end.
10. A zoom lens according to claim 1, wherein the zoom lens
satisfies an expression 3.59.ltoreq.fT/f1<8.00, where fT
represents a focal length of the zoom lens at a telephoto end.
11. A zoom lens according to claim 1, wherein the zoom lens
satisfies an expression -12.00<f1/f2<-5.00.
12. A zoom lens comprising in order from an object side to an image
side: a first lens unit having a positive refractive power and
configured not to move for zooming; a second lens unit having a
negative refractive power and configured to move for zooming; at
least one lens unit configured to move for zooming; and a rear lens
unit including an aperture stop, wherein an interval of each pair
of adjacent lens units of the first lens unit, the second lens
unit, the at least one lens unit and the rear lens unit is changed
for zooming, and wherein the zoom lens satisfies expressions
-12.00<f1/f2<-5.00;
-1.00<f2/(2.times.fW.times.tan(.omega._W))<-0.30; and
-0.50<f2/L2W<-0,05, where fW represents a focal length of the
zoom lens at a wide angle end, f1 represents a focal length of the
first lens unit, f2 represents a focal length of the second lens
unit, .omega._W represents a half angle of field of the zoom lens
at the wide angle end, and L2W represents an interval on art
optical axis between a surface, closest to the image side, of the
second lens unit and a surface, closest to the object side, of the
at least one lens unit at the wide angle end.
13. A zoom lens according to claim 12, wherein the zoom lens
satisfies an expression 9.00<.beta.2T/.beta.2W<35.00, where
.beta.2W represents a lateral magnification of the second lens unit
at the wide angle end and at infinity in an object distance, and
.beta.2T represents a lateral magnification of the second lens unit
at a telephoto end and at infinity in the object distance.
14. A zoom lens according to claim 12, wherein the zoom lens
satisfies an expression
4.00<LF/(2.times.fW.times.tan(.omega._W))<20.00, where LF
represents a distance on an optical axis from a surface, closest to
the object side, of the first lens unit to the aperture stop.
15. A zoom lens according to claim 12, wherein the zoom lens
satisfies an expression
10.00<fT/(2.times.fW.times.tan(.omega._W))<40.00 where fT
represents a focal length of the zoom lens at a telephoto end.
16. A zoom lens according to claim 12, wherein the aperture stop
does not move for zooming.
17. An image pickup apparatus comprising: a zoom lens defined in
claim 12; and an image pickup element configured to receive an
image formed by the zoom lens.
18. A zoom lens according to claim 12, wherein the zoom lens
performs focusing with a lens unit which is disposed on art object
side of the aperture stop.
19. A zoom lens according to claim 12, wherein the zoom lens
satisfies an expression 2.00<fT/f1<8.00, where fT represents
a focal length of the zoom lens at a telephoto end.
Description
BACKGROUND OF THE INVENTION
Field of the Invention
The present invention relates to a zoom lens and an image pickup
apparatus including the zoom lens, which are particularly suitable
for use in a broadcasting television camera, a cinema camera, a
video camera, a digital still camera, and a silver-halide film
camera.
Description of the Related Art
In recent years, as an image pickup apparatus such as a television
camera, a cinema camera, a video camera, or a film camera, a large
format camera having features of a shallow depth of field and
beautiful bokeh (blur) quality for expanding visual expression is
used. As a zoom lens to be attached to the large format camera, a
small and lightweight zoom lens having a high zoom ratio and high
optical performance for securing mobility and improving flexibility
in photography has been in demand. As the zoom lens having the high
zoom ratio, as proposed in Japanese Patent Application Laid-Open
Nos. 2011-175185 and 2012-150248, there has been known a
positive-lead type zoom lens in which a lens unit having a positive
refractive power is arranged closest to an object side and which
includes four or more lens units in total.
In general, when an image size of the image pickup apparatus
becomes large, the zoom lens to be attached thereto is accordingly
increased in size. Therefore, in a case of being attached to the
image pickup apparatus having the large image size, reductions in
size and weight of the zoom lens become a problem.
The positive-lead type zoom lens described above is relatively easy
to achieve the high zoom ratio. However, in order to realize an
even higher zoom ratio, a moving amount of a second lens unit
accompanying zooming is increased, which makes it difficult to
achieve both the high zoom ratio and the reductions in size and
weight. In order to realize the high zoom ratio and the reductions
in size and weight with the above-mentioned positive-lead type zoom
lens, it is particularly important to appropriately set refractive
powers of a first lens unit and the second lens unit.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide, as the
above-mentioned positive-lead type zoom lens, a zoom lens which
realizes a high zoom ratio and reductions in size and weight, and
has high performance over an entire zoom range. More specifically,
it is an object of the present invention to provide a zoom lens
having an angle of field of about 46.8 to 56.8 degrees at a wide
angle end, an angle of field of about 1.6 to 4.5 degrees at a
telephoto end, and a magnification of about 11.times. to
30.times..
According to one embodiment of the present invention, there is
provided a zoom lens, including, in order from an object side to an
image side: a first lens unit having a positive refractive power
that does not move for zooming; a second lens unit having a
negative refractive power that moves during zooming; at least one
lens unit that moves during zooming; and a rear lens unit including
an aperture stop, the zoom lens satisfying the following
expressions: -12.00<f1/f2<-4.00; and
-1.00<f2/(2.times.fW.times.tan(.omega._W))<-0.30, where fW
represents a focal length of the zoom lens at a wide angle end, f1
represents a focal length of the first lens unit, f2 represents a
focal length of the second lens unit, and .omega._W represents a
half angle of field of the zoom lens at the wide angle end.
According to the one embodiment of the present invention, as a zoom
lens for a large format camera, in particular, there may be
obtained the zoom lens which realizes the high zoom ratio and the
reductions in size and weight, and has high optical performance
over the entire zoom range from the wide angle end to the telephoto
end, and an image pickup apparatus including the zoom lens.
Further features of the present invention will become apparent from
the following description of exemplary embodiments with reference
to the attached drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a lens cross-sectional view when focus is at infinity at
a wide angle end in a zoom lens according to Embodiment 1 of the
present invention.
FIG. 2A is a longitudinal aberration diagram when the focus is at
infinity at the wide angle end in Embodiment 1.
FIG. 2B is a longitudinal aberration diagram when the focus is at
infinity at a focal length of 180.00 mm in Embodiment 1.
FIG. 2C is a longitudinal aberration diagram when the focus is at
infinity at a telephoto end in Embodiment 1.
FIG. 3 is a lens cross-sectional view when focus is at infinity at
a wide angle end in a zoom lens according to Embodiment 2 of the
present invention.
FIG. 4A is a longitudinal aberration diagram when the focus is at
infinity at the wide angle end in Embodiment 2.
FIG. 4B is a longitudinal aberration diagram when the focus is at
infinity at a focal length of 274.00 mm in Embodiment 2.
FIG. 4C is a longitudinal aberration diagram when the focus is at
infinity at a telephoto end in Embodiment 2.
FIG. 5 is a lens cross-sectional view when focus is at infinity at
a wide angle end in a zoom lens according to Embodiment 3 of the
present invention.
FIG. 6A is a longitudinal aberration diagram when the focus is at
infinity at the wide angle end in Embodiment 3.
FIG. 6B is a longitudinal aberration diagram when the focus is at
infinity at a focal length of 166.00 mm in Embodiment 3.
FIG. 6C is a longitudinal aberration diagram when the focus is at
infinity at a telephoto end in Embodiment 3.
FIG. 7 is a lens cross-sectional view when focus is at infinity at
a wide angle end in a zoom lens according to Embodiment 4 of the
present invention.
FIG. 8A is a longitudinal aberration diagram when the focus is at
infinity at the wide angle end in Embodiment 4.
FIG. 8B is a longitudinal aberration diagram when the focus is at
infinity at a focal length of 180.00 mm in Embodiment 4.
FIG. 8C is a longitudinal aberration diagram when the focus is at
infinity at a telephoto end in Embodiment 4.
FIG. 9 is a lens cross-sectional view when focus is at infinity at
a wide angle end in a zoom lens according to Embodiment 5 of the
present invention.
FIG. 10A is a longitudinal aberration diagram when the focus is at
infinity at the wide angle end in Embodiment 5.
FIG. 10B is a longitudinal aberration diagram when the focus is at
infinity at a focal length of 180.00 mm in Embodiment 5.
FIG. 10C is a longitudinal aberration diagram when the focus is at
infinity at a telephoto end in Embodiment 5.
FIG. 11 is a lens cross-sectional view when focus is at infinity at
a wide angle end in a zoom lens according to Embodiment 6 of the
present invention.
FIG. 12A is a longitudinal aberration diagram when the focus is at
infinity at the wide angle end in Embodiment 6.
FIG. 12B is a longitudinal aberration diagram when the focus is at
infinity at a focal length of 180.00 mm in Embodiment 6.
FIG. 12C is a longitudinal aberration diagram when the focus is at
infinity at a telephoto end in Embodiment 6.
FIG. 13 is a schematic diagram of a main part of an image pickup
apparatus according to the present invention.
FIG. 14A is an optical path diagram when the focus is at an object
at infinity at the wide angle end in Embodiment 6.
FIG. 14B is an optical path diagram when the focus is at the object
at infinity at the telephoto end in Embodiment 6.
DESCRIPTION OF THE EMBODIMENTS
Now, features of a zoom lens according to the present invention are
described.
According to the present invention, there is provided a zoom lens,
including, in order from an object side to an image side: a first
lens unit having a positive refractive power that does not move for
zooming; a second lens unit having a negative refractive power that
moves during zooming; at least one lens unit that moves during
zooming; and a rear lens unit including an aperture stop, the zoom
lens satisfying the following expressions: -12.00<f1/f2<-4.00
(1) -1.00<f2/(2.times.fW.times.tan(.omega._W))<-0.30 (2)
where fW represents a focal length of the zoom lens at a wide angle
end, f1 represents a focal length of the first lens unit, f2
represents a focal length of the second lens unit, and .omega._W
represents a half angle of field at the wide angle end.
The conditional expression (1) defines a ratio of the focal length
of the first lens unit U1 to the focal length of the second lens
unit U2. The conditional expression (1) is satisfied to
satisfactorily correct aberration variations of the zoom lens and
realize both a high zoom ratio and reductions in size and weight.
When the ratio exceeds the upper limit of the conditional
expression (1), the focal length of the first lens unit is too
short, which makes it difficult to correct a spherical aberration,
an axial chromatic aberration, and the like especially at a
telephoto end, and the focal length of the second lens unit is too
long, which increases a moving amount of the second lens unit
accompanying zooming and hence makes it difficult to realize both
the high zoom ratio and the reductions in size and weight. When the
ratio falls below the lower limit of the conditional expression
(1), the focal length of the first lens unit is increased, which
makes an effective diameter and a total lens length of the first
lens unit large and makes it difficult to reduce the size and
weight of the zoom lens, and the focal length of the second lens
unit is too short, which makes it difficult to correct aberration
variations in the spherical aberration, the axial chromatic
aberration, and the like.
It is more preferred to set the conditional expression (1) as
follows: -8.00<f1/f2<-5.00 (1a).
The conditional expression (2) defines a ratio of the focal length
of the second lens unit U2 to an image size at the wide angle end.
The conditional expression (2) is satisfied to satisfactorily
correct the aberration variations of the zoom lens and realize both
the high zoom ratio and the reductions in size and weight. When the
ratio exceeds the upper limit of the conditional expression (2),
the focal length of the second lens unit is too short, which makes
it difficult to correct the aberration variations in the spherical
aberration, the axial chromatic aberration, and the like. When the
ratio falls below the lower limit of the conditional expression
(2), the focal length of the second lens unit is too long, which
increases the moving amount of the second lens unit accompanying
the zooming and hence makes it difficult to realize both the high
zoom ratio and the reductions in size and weight.
It is more preferred to set the conditional expression (1) as
follows: -0.99<f2/(2.times.fW.times.tan(.omega._W))<-0.50
(2a).
By satisfying the above-mentioned conditional expressions, despite
being a zoom lens for a large format camera, the zoom lens
according to the present invention realizes the high zoom ratio and
the reductions in size and weight, and attains high optical
performance over an entire zoom range from the wide angle end to
the telephoto end.
The zoom lens according to the present invention has a further
feature of satisfying a ratio of a lateral magnification .beta.2W
at the wide angle end of the second lens unit when focus is at
infinity to a lateral magnification .beta.2T at the telephoto end
of the second lens unit, which is defined by the conditional
expression (3): 9.00<.beta.2T/.beta.2W<35.00 (3).
The conditional expression (3) is satisfied to satisfactorily
correct the aberration variations of the zoom lens and allow the
realization of both the high zoom ratio and the reductions in size
and weight. When the ratio exceeds the upper limit of the
conditional expression (3), a zoom magnification performed by the
second lens unit becomes too large, which makes the refractive
power of the second lens unit strong and makes it difficult to
correct the spherical aberration, the axial chromatic aberration,
and the like especially at the telephoto end. When the ratio falls
below the lower limit of the conditional expression (3), the zoom
magnification performed by the second lens unit becomes too small,
which makes it difficult to achieve the high zoom ratio.
It is more preferred to set the conditional expression (3) as
follows: 9.00<.beta.2T/.beta.2W<30.00 (3a).
The zoom lens according to the present invention has a further
feature of satisfying a ratio of a focal length at the telephoto
end of the zoom lens to the focal length of the first lens unit,
which is defined by the conditional expression (4):
2.00<fT/f1<8.00 (4).
The conditional expression (4) is satisfied to allow the
realization of both the high zoom ratio and increase in
performance. When the ratio exceeds the upper limit of the
conditional expression (4), the focal length of the first lens unit
becomes too short with respect to the focal length at the telephoto
end of the zoom lens, which makes it difficult to suppress the
various aberrations ascribable to the first lens unit, such as the
spherical aberration and the axial chromatic aberration, especially
at the telephoto end. When the ratio falls below the lower limit of
the conditional expression (4), the focal length of the first lens
unit becomes too long with respect to the focal length at the
telephoto end of the zoom lens, which moves an object point
position of a zoom lens unit away and hence increases a moving
amount accompanying zooming to make the high zoom ratio
difficult.
It is more preferred to set the conditional expression (4) as
follows: 2.00<fT/f1<7.00 (4a).
The zoom lens according to the present invention has a further
feature of satisfying a ratio of the focal length f2 of the second
lens unit to an air interval on an optical axis between the second
lens unit and a third lens unit (interval on the optical axis
between a surface on an image side of the second lens unit and a
surface on an object side of the third lens unit) at the wide angle
end L2W, which is defined by the conditional expression (5):
-0.50<f2/L2W<-0.05 (5).
The conditional expression (5) is satisfied to satisfactorily
correct the aberration variations of the zoom lens and allow the
realization of both the high zoom ratio and the reductions in size
and weight. When the ratio exceeds the upper limit of the
conditional expression (5), the focal length of the second lens
unit becomes too short with respect to the interval between the
second lens unit and the third lens unit at the wide angle end,
which makes it difficult to satisfactorily correct the aberration
variations of the zoom lens. When the ratio falls below the lower
limit of the conditional expression (5), the focal length of the
second lens unit becomes too long with respect to the interval
between the second lens unit and the third lens unit at the wide
angle end, with the result that an enough moving amount of the
second lens unit accompanying zooming cannot be secured, which
makes it difficult to achieve the high zoom ratio.
It is more preferred to set the conditional expression (5) as
follows: -0.40<f2/L2W<-0.10 (5a).
The zoom lens according to the present invention has a further
feature of satisfying a ratio of a distance LF on the optical axis
from a surface closest to the object side of the first lens unit to
the aperture stop to the image size at the wide angle end, which is
defined by the conditional expression (6):
4.00<LF/(fW.times.tan(2.times..omega._W))<20.00 (6).
The conditional expression (6) is satisfied to satisfactorily
correct the aberration variations of the zoom lens and allow the
realization of both the high zoom ratio and the reductions in size
and weight. When the ratio exceeds the upper limit of the
conditional expression (6), a total length of the zoom lens unit
becomes too long with respect to the image size, which makes it
difficult to achieve the reductions in size and weight. When the
ratio falls below the lower limit of the conditional expression
(6), the total length of the zoom lens unit becomes too short with
respect to the image size, and the refractive power of especially
the second lens unit needs to be made strong in order to secure the
zoom magnification, which makes it difficult to satisfactorily
correct the aberration variations of the zoom lens and achieve the
high zoom ratio.
It is more preferred to set the conditional expression (6) as
follows: 6.00<LF/(2.times.fW.times.tan(.omega._W))<15.00
(6a).
The zoom lens according to the present invention has a further
feature of satisfying a ratio of a focal length fT at the telephoto
end of the zoom lens to the image size at the wide angle end, which
is defined by the conditional expression (7):
10.00<fT/(2.times.fW.times.tan(.omega._W))<40.00 (7).
The conditional expression (7) is satisfied to satisfactorily
correct the aberration variations of the zoom lens and allow the
realization of both an increased telephoto range and the reductions
in size and weight. When the ratio exceeds the upper limit of the
conditional expression (7), the focal length of the zoom lens at
the telephoto end is too long with respect to the image size, which
makes it difficult to correct the spherical aberration, the axial
chromatic aberration, and the like especially at the telephoto end,
and the effective diameter and the total lens length of the first
lens unit are increased, which makes it difficult to realize the
reductions in size and weight of the zoom lens. When the ratio
falls below the lower limit of the conditional expression (7), the
focal length of the zoom lens at the telephoto end is too short
with respect to the image size, which is disadvantageous in
increasing the telephoto range of the zoom lens.
It is more preferred to set the conditional expression (7) as
follows: 10.00<fT/(2.times.fW.times.tan(.omega._W))<35.00
(7a).
Through the satisfaction of the above-mentioned conditional
expressions in the zoom lens according to the present invention,
the aberration variations may be satisfactorily corrected and both
the high zoom ratio and the reductions in size and weight may be
realized.
Embodiment 1
FIG. 1 is a lens cross-sectional view when focus is at an object at
infinity at a wide angle end in a zoom lens according to Embodiment
1. The zoom lens according to Embodiment 1 of the present invention
includes, in order from the object side, a first lens unit having a
positive refractive power that does not move for zooming, a second
lens unit having a negative refractive power that moves during
zooming, at least one lens unit that moves during zooming, and a
rear lens unit including the aperture stop.
The first lens unit U1 is a lens unit having the positive
refractive power that does not move for zooming. The second lens
unit U2 is a variator lens unit having a negative refractive power
for zooming that moves toward the image side during zooming from
the wide angle end (short focal length end) to the telephoto end
(long focal length end). The "at least one lens unit that moves
during zooming" in this Embodiment includes, in order from the
object side to the image side, a third lens unit U3 and a fourth
lens unit U4. The third lens unit U3 is a variator lens unit having
a positive refractive power for zooming that moves during zooming
from the wide angle end (short focal length end) to the telephoto
end (long focal length end). The fourth lens unit U4 is a
compensator lens unit having a positive refractive power that moves
in conjunction with the second lens unit U2 and the third lens unit
U3 to correct an image plane variation accompanying zooming.
Moreover, the fourth lens unit U4 that moves toward the object side
during focus adjustment from the object at infinity to an object at
close distance. In this Embodiment, the rear lens unit includes, in
order from the object side to the image side, the aperture stop SP
that does not move for zooming, and a fifth lens unit (relay lens
unit) having a negative refractive power that does not move for
zooming. An image plane IP corresponds to an imaging plane of a
solid-state image pickup element (photoelectric transducer).
The lens units in Embodiment 1 have the following configurations in
order from the object side to the image side. The first lens unit
U1 includes a positive lens, a negative lens, and three positive
lenses. The second lens unit U2 includes three negative lenses and
a positive lens. The third lens unit U3 includes a positive lens, a
negative lens, and a positive lens. The fourth lens unit U4
includes a positive lens and a cemented lens of a negative lens and
a positive lens. The fifth lens unit U5 includes the aperture stop
SP, two cemented lenses of a negative lens and a positive lens, a
cemented lens of a negative lens, a positive lens, and a negative
lens, and three cemented lenses of a positive lens and a negative
lens.
Numerical Embodiment corresponding to Embodiment 1 is described in
<Numerical Embodiment 1> below. In the Numerical Embodiments
corresponding to the Embodiments described below, respectively, r
represents a curvature radius of each surface counted from the
object side, d represents an interval between surfaces, and nd and
.nu.d represent a refractive index and an Abbe number of each
optical member. In this case, when an X axis corresponds to the
optical axis, an H axis corresponds to an axis perpendicular to the
optical axis, a traveling direction of light corresponds to a
positive direction, a paraxial curvature radius is represented by
R, a conic constant is represented by k, and aspherical
coefficients are represented by A3, A4, A5, A6, A7, A8, A9, A10,
A11, and A12, an aspherical surface shape is expressed by the
following expression.
.times..times..times..times..times..times..times..times..times..times..ti-
mes..times..times..times..times..times..times..times..times..times..times.-
.times..times..times..times..times..times..times..times..times..times.
##EQU00001## where e-Z means .times.10.sup.-Z. The mark *
represents the aspherical surface.
FIGS. 2A, 2B, and 2C are longitudinal aberration diagrams when the
focus is at infinity at the wide angle end, a focal length of
180.00 mm, and the telephoto end, respectively, in the zoom lens
according to Embodiment 1. In the figures, the value of the focal
length is a value obtained when expressing Numerical Embodiment in
units of mm, and the same applies to Numerical Embodiments below.
In aberration diagrams, the spherical aberration is illustrated
with respect to an e-Line and a g-Line. An astigmatism is
illustrated on a meridional image plane (.DELTA.M) with respect to
the e-Line and on a sagittal image plane (.DELTA.S) with respect to
the e-Line. A lateral chromatic aberration is expressed by the
g-Line. In all of the aberration diagrams, the spherical
aberration, the astigmatism, the distortion, and the lateral
chromatic aberration are drawn on scales of 0.5 mm, 0.5 mm, 5%, and
0.05 mm, respectively. Symbol Fno represents an F-number, and
symbol a represents a half angle of field. Note that, the wide
angle end and the telephoto end refer to zoom positions when the
second lens unit U2 for zooming is located at both ends of a range
in which the second lens unit U2 is mechanically movable on the
optical axis.
Table 1 shows corresponding values of the conditional expressions
of Numerical Embodiment 1. Numerical Embodiment 1 satisfies all of
the conditional expressions (1) to (7). The zoom lens in this
Embodiment is small and lightweight despite being the zoom lens for
the large format camera, and attains the high zoom ratio with a
zoom ratio of 20.0.times., a half angle of field at the wide angle
end of 28.4 degrees, and a half angle of field at the telephoto end
of 1.6 degrees, and the high optical performance over the entire
zoom range from the wide angle end to the telephoto end.
Embodiment 2
FIG. 3 is a lens cross-sectional view when the focus is at the
object at infinity at the wide angle end in the zoom lens according
to Embodiment 2 of the present invention. The zoom lens according
to Embodiment 2 of the present invention includes, in order from
the object side, a first lens unit having a positive refractive
power what does not move for zooming, a second lens unit having a
negative refractive power that moves during zooming, at least one
lens unit that moves during zooming, and a rear lens unit including
an aperture stop.
The first lens unit U1 is a lens unit having the positive
refractive power that does not move for zooming. The second lens
unit U2 is a variator lens unit having a negative refractive power
for zooming that moves toward the image side during zooming from
the wide angle end (short focal length end) to the telephoto end
(long focal length end). The "at least one lens unit that moves
during zooming" in this Embodiment includes, in order from the
object side to the image side, a third lens unit U3 and a fourth
lens unit U4. The third lens unit U3 is a variator lens unit having
a positive refractive power for zooming that moves during zooming
from the wide angle end (short focal length end) to the telephoto
end (long focal length end). The fourth lens unit U4 is a
compensator lens unit having a positive refractive power that moves
in conjunction with the second lens unit U2 and the third lens unit
U3 to correct the image plane variation accompanying zooming.
Moreover, the fourth lens unit U4 that moves toward the object side
during focusing from the object at infinity to an object at close
distance. In this Embodiment, the rear lens unit is represented by
U5 in the figures and includes, in order from the object side to
the image side, the aperture stop SP that does not move for
zooming, a first sub lens unit U51 having a negative refractive
power, a third sub lens unit U53 having a positive refractive
power, and a second sub lens unit U52 having a negative refractive
power, which moves toward the image side during zooming.
In Embodiment 2, all the lens configurations of the first to fourth
lens units are the same as those in Numerical Embodiment 1. The
fifth lens unit U5 includes the aperture stop SP, the first sub
lens unit U51 including two cemented lenses of a negative lens and
a positive lens, the second sub lens unit U52 including a negative
lens, and two cemented lenses of a positive lens and a negative
lens, and the third sub lens unit U53 including two cemented lenses
of a positive lens and a negative lens.
Numerical Embodiment corresponding to Embodiment 2 is described in
<Numerical Embodiment 2> below.
FIGS. 4A, 4B, and 4C are longitudinal aberration diagrams when the
focus is at infinity at the wide angle end, a focal length of
274.00 mm, and the telephoto end, respectively, in the zoom lens
according to Embodiment 2. In the figures, the value of the focal
length is a value obtained when expressing Numerical Embodiment in
units of mm, and the same applies to Numerical Embodiments below.
In aberration diagrams, the spherical aberration is illustrated
with respect to the e-Line and the g-Line. The astigmatism is
illustrated on the meridional image plane (.DELTA.M) with respect
to the e-Line and on the sagittal image plane (.DELTA.S) with
respect to the e-Line. The lateral chromatic aberration is
expressed by the g-Line. In all of the aberration diagrams, the
spherical aberration, the astigmatism, a the distortion, and the
lateral chromatic aberration are drawn on scales of 0.5 mm, 0.5 mm,
5%, and 0.05 mm, respectively. Symbol Fno represents the F-number,
and symbol .omega. represents the half angle of field. Note that,
the wide angle end and the telephoto end refer to the zoom
positions when the second lens unit U2 for zooming is located at
both ends of the range in which the second lens unit U2 is
mechanically movable on the optical axis.
Table 1 shows corresponding values of the conditional expressions
of Numerical Embodiment 2. Numerical Embodiment 2 satisfies all of
the conditional expressions (1) to (7). The zoom lens in this
Embodiment is small and lightweight despite being the zoom lens for
the large format camera, and attains the high zoom ratio with a
zoom ratio of 30.0.times., a half angle of field at the wide angle
end of 23.4 degrees, and a half angle of field at the telephoto end
of 0.8 degree, and the high optical performance over the entire
zoom range from the wide angle end to the telephoto end.
Embodiment 3
FIG. 5 is a lens cross-sectional view when focus is at the object
at infinity at the wide angle end in the zoom lens according to
Embodiment 3 of the present invention. The zoom lens according to
Embodiment 3 of the present invention includes, in order from the
object side, a first lens unit having a positive refractive power
that does not move for zooming, a second lens unit having a
negative refractive power that moves during zooming, at least one
lens unit that moves during zooming, and a rear lens unit including
an aperture stop.
The first lens unit U1 is a lens unit having a positive refractive
power that does not move for zooming. The second lens unit U2 is a
variator lens unit having a negative refractive power for zooming
that moves toward the image side during zooming from the wide angle
end (short focal length end) to the telephoto end (long focal
length end). The "at least one lens unit that moves during zooming"
in this Embodiment includes, in order from the object side to the
image side, a third lens unit U3 and a fourth lens unit U4. The
third lens unit U3 is a variator lens unit having a positive
refractive power for zooming that moves during zooming from the
wide angle end (short focal length end) to the telephoto end (long
focal length end). The fourth lens unit U4 is a compensator lens
unit having a positive refractive power that moves in conjunction
with the second lens unit U2 and the third lens unit U3 to correct
the image plane variation accompanying zooming. Moreover, the
fourth lens unit U4 that moves toward the object side during focus
adjustment from the object at infinity to the object at close
distance. In this Embodiment, the rear lens unit includes, in order
from the object side to the image side, the aperture stop SP that
does not move for zooming, and a fifth lens unit (relay lens unit)
having a negative refractive power that does not move for zooming.
The image plane IP corresponds to the imaging plane of the
solid-state image pickup element (photoelectric transducer).
The lens units in Embodiment 3 have the following configurations in
order from the object side to the image side. The first lens unit
U1 includes a positive lens, a negative lens, and three positive
lenses. The second lens unit U2 includes three negative lenses and
a positive lens. The third lens unit U3 includes a positive lens, a
negative lens, and a positive lens. The fourth lens unit U4
includes a positive lens and a cemented lens of a negative lens and
a positive lens. The fifth lens unit U5 includes the aperture stop
SP, a cemented lens of a negative lens and a positive lens, a
cemented lens of a positive lens and a negative lens, a cemented
lens of a negative lens, a positive lens, and a negative lens, and
two cemented lenses of a positive lens and a negative lens.
Numerical Embodiment corresponding to Embodiment 3 is described in
<Numerical Embodiment 3> below.
FIGS. 6A, 6B, and 6C are longitudinal aberration diagrams when the
focus is at infinity at the wide angle end, a focal length of
166.00 mm, and the telephoto end, respectively, in the zoom lens
according to Embodiment 3. In the figures, the value of the focal
length is a value obtained when expressing Numerical Embodiment in
units of mm, and the same applies to Numerical Embodiments below.
In aberration diagrams, the spherical aberration is illustrated
with respect to the e-Line and the g-Line. The astigmatism is
illustrated on the meridional image plane (.DELTA.M) with respect
to the e-Line and on the sagittal image plane (.DELTA.S) with
respect to the e-Line. The lateral chromatic aberration is
expressed by the g-Line. In all of the aberration diagrams, the
spherical aberration, the astigmatism, the distortion, and the
lateral chromatic aberration are drawn on scales of 0.5 mm, 0.5 mm,
5%, and 0.05 mm, respectively. Symbol Fno represents the F-number,
and symbol .omega. represents the half angle of field. Note that,
the wide angle end and the telephoto end refer to the zoom
positions when the second lens unit U2 for zooming is located at
both ends of the range in which the second lens unit U2 is
mechanically movable on the optical axis.
Table 1 shows corresponding values of the conditional expressions
of Numerical Embodiment 3. Numerical Embodiment 3 satisfies all of
the conditional expressions (1) to (7). The zoom lens in this
Embodiment is small and lightweight despite being the zoom lens for
the large format camera, and attains the high zoom ratio with a
zoom ratio of 11.0.times., a half angle of field at the wide angle
end of 23.4 degrees, and a half angle of field at the telephoto end
of 2.3 degrees, and the high optical performance over the entire
zoom range from the wide angle end to the telephoto end.
Embodiment 4
FIG. 7 is a lens cross-sectional view when the focus is at the
object at infinity at the wide angle end in the zoom lens according
to Embodiment 4 of the present invention. The zoom lens according
to Embodiment 4 of the present invention includes, in order from
the object side, a first lens unit having a positive refractive
power that does not move for zooming, a second lens unit having a
negative refractive power that moves during zooming, at least one
lens unit that moves during zooming, and a rear lens unit including
an aperture stop.
The first lens unit U1 is a lens unit having a positive refractive
power that does not move for zooming. The second lens unit U2 is a
variator lens unit having a negative refractive power for zooming
that moves toward the image side during zooming from the wide angle
end (short focal length end) to the telephoto end (long focal
length end). The "at least one lens unit that moves during zooming"
in this Embodiment includes, in order from the object side to the
image side, a third lens unit U3 and a fourth lens unit U4. The
third lens unit U3 is a variator lens unit having a positive
refractive power for zooming that moves during zooming from the
wide angle end (short focal length end) to the telephoto end (long
focal length end). The fourth lens unit U4 is a compensator lens
unit having a positive refractive power that moves in conjunction
with the second lens unit U2 and the third lens unit U3 to correct
the image plane variation accompanying zooming. Moreover, the
fourth lens unit U4 that moves toward the object side during focus
adjustment from the object at infinity to the object at close
distance. In this Embodiment, the rear lens unit includes, in order
from the object side to the image side, the aperture stop SP that
does not move for zooming, and a fifth lens unit (relay lens unit)
having a negative refractive power that does not move for zooming.
The image plane IP corresponds to the imaging plane of the
solid-state image pickup element (photoelectric transducer).
The lens units in Embodiment 4 have the following configurations in
order from the object side to the image side.
The first lens unit U1 includes a positive lens, a negative lens,
and three positive lenses. The second lens unit U2 includes three
negative lenses and a positive lens. The third lens unit U3
includes a positive lens, a negative lens, and a positive lens. The
fourth lens unit U4 includes a positive lens and a cemented lens of
a negative lens and a positive lens. The fifth lens unit U5
includes the aperture stop SP, two cemented lenses of a negative
lens and a positive lens, a cemented lens of a negative lens, a
positive lens, and a negative lens, and three cemented lenses of a
positive lens and a negative lens. The lens configurations are the
same as those in Embodiment 1.
Numerical Embodiment corresponding to Embodiment 4 is described in
<Numerical Embodiment 4> below.
FIGS. 8A, 8B, and 8C are longitudinal aberration diagrams when the
focus is at infinity at the wide angle end, a focal length of
180.00 mm, and the telephoto end, respectively, in the zoom lens
according to Embodiment 4. In the figures, the value of the focal
length is a value obtained when expressing Numerical Embodiment in
units of mm, and the same applies to Numerical Embodiments below.
In aberration diagrams, the spherical aberration is illustrated
with respect to the e-Line and the g-Line. The astigmatism is
illustrated on the meridional image plane (.DELTA.M) with respect
to the e-Line and on the sagittal image plane (.DELTA.S) with
respect to the e-Line. The lateral chromatic aberration is
expressed by the g-Line. In all of the aberration diagrams, the
spherical aberration, the astigmatism, the distortion, and the
lateral chromatic aberration are drawn on scales of 0.5 mm, 0.5 mm,
5%, and 0.05 mm, respectively. Symbol Fno represents the F-number,
and symbol .omega. represents the half angle of field. Note that,
the wide angle end and the telephoto end refer to the zoom
positions when the second lens unit U2 for zooming is located at
both ends of the range in which the second lens unit U2 is
mechanically movable on the optical axis.
Table 1 shows corresponding values of the conditional expressions
of Numerical Embodiment 4. Numerical Embodiment 4 satisfies all of
the conditional expressions (1) to (7). The zoom lens in this
Embodiment is small and lightweight despite being the zoom lens for
the large format camera, and attains the high zoom ratio with a
zoom ratio of 20.0.times., a half angle of field at the wide angle
end of 20.3 degrees, and a half angle of field at the telephoto end
of 1.1 degrees, and the high optical performance over the entire
zoom range from the wide angle end to the telephoto end.
Embodiment 5
FIG. 9 is a lens cross-sectional view when focus is at the object
at infinity at the wide angle end in the zoom lens according to
Embodiment 5. The zoom lens according to Embodiment 5 of the
present invention includes, in order from the object side, a first
lens unit having a positive refractive power that does not move for
zooming, a second lens unit having a negative refractive power that
moves during zooming, at least one lens unit that moves during
zooming, and a rear lens unit including an aperture stop.
FIGS. 14A and 14B are optical path diagrams when the focus is at
the object at infinity at the wide angle end and the telephoto end,
respectively, in Embodiment 5. An axial ray passing through the
second sub lens unit U52 is substantially afocal, and a height of
the axial ray from the optical axis is substantially constant at
the wide angle end and the telephoto end. Therefore, an effect of
the second sub lens unit U52 being moved during zooming on
variations during zooming in axial aberrations such as the
spherical aberration and the axial chromatic aberration is small.
On the other hand, a height of an off-axial ray passing through the
second sub lens unit U52 from the optical axis is higher at the
telephoto end than at the wide angle end. Therefore, the second sub
lens unit U52 may be moved during zooming to effectively correct
the variations during zooming in off-axial aberrations such as a
field curvature and the lateral chromatic aberration.
The first lens unit U1 is a lens unit having the positive
refractive power that does not move for zooming. The second lens
unit U2 is a variator lens unit having a negative refractive power
for zooming that moves toward the image side during zooming from
the wide angle end (short focal length end) to the telephoto end
(long focal length end). The "at least one lens unit that moves
during zooming" in this Embodiment includes, in order from the
object side to the image side, a third lens unit U3 and a fourth
lens unit U4. The third lens unit U3 is a variator lens unit having
a positive refractive power for zooming that moves during zooming
from the wide angle end (short focal length end) to the telephoto
end (long focal length end). The fourth lens unit U4 is a
compensator lens unit having a positive refractive power that moves
in conjunction with the second lens unit U2 and the third lens unit
U3 to correct the image plane variation accompanying zooming.
Moreover, the fourth lens unit U4 that moves toward the object side
during focusing from the object at infinity to an object at close
distance. In this Embodiment, the rear lens unit is represented by
U5 in the figures and includes, in order from the object side to
the image side, the aperture stop SP that does not move for
zooming, a first sub lens unit U51 having a negative refractive
power, a third sub lens unit U53 having a positive refractive
power, and a second sub lens unit U52 having a negative refractive
power that moves toward the image side during zooming.
The lens units in Embodiment 5 have the following configurations in
order from the object side to the image side. The first lens unit
U1 includes a positive lens, a negative lens, and three positive
lenses. The second lens unit U2 includes three negative lenses and
a positive lens. The third lens unit U3 includes a positive lens, a
negative lens, and a positive lens. The fourth lens unit U4
includes a positive lens and a cemented lens of a negative lens and
a positive lens. The fifth lens unit U5 includes the aperture stop
5P, a first sub lens unit U51 including two cemented lenses of a
negative lens and a positive lens, a second sub lens unit U52
including a cemented lens of a negative lens and a positive lens,
and a cemented lens of a negative lens, a positive lens, and a
negative lens, and a third sub lens unit U53 including two cemented
lenses of a positive lens and a negative lens.
Numerical Embodiment corresponding to Embodiment 5 is described in
<Numerical Embodiment 5> below.
FIGS. 10A, 10B, and 10C are longitudinal aberration diagrams when
the focus is at infinity at the wide angle end, a focal length of
180.00 mm, and the telephoto end, respectively, in the zoom lens
according to Embodiment 5. In the figures, the value of the focal
length is a value obtained when expressing Numerical Embodiment in
units of mm, and the same applies to Numerical Embodiments below.
In aberration diagrams, the spherical aberration is illustrated
with respect to the e-Line, the g-Line, a C-Line, an F-Line, and
950 nm. The astigmatism is illustrated on the meridional image
plane (.DELTA.M) with respect to the e-Line and on the sagittal
image plane (.DELTA.S) with respect to the e-Line. The lateral
chromatic aberration is expressed by the g-Line, the C-Line, the
F-Line, and 950 nm. In all of the aberration diagrams, the
spherical aberration, the astigmatism, the distortion, and the
lateral chromatic aberration are drawn on scales of 0.5 mm, 0.5 mm,
5%, and 0.05 mm, respectively. Symbol Fno represents the F-number,
and symbol .omega. represents the half angle of field. Note that,
the wide angle end and the telephoto end refer to the zoom
positions when the second lens unit U2 for zooming is located at
both ends of the range in which the second lens unit U2 is
mechanically movable on the optical axis.
Table 1 shows corresponding values of the conditional expressions
of Numerical Embodiment 5. Numerical Embodiment 5 satisfies all of
the conditional expressions (1) to (7). The zoom lens in this
Embodiment is small and lightweight despite being the zoom lens for
the large format camera, and attains the high zoom ratio with a
zoom ratio of 20.0.times., a half angle of field at the wide angle
end of 28.4 degrees, and a half angle of field at the telephoto end
of 1.6 degrees, and the high optical performance over the entire
zoom range from the wide angle end to the telephoto end.
Embodiment 6
FIG. 11 is a lens cross-sectional view when the focus is at the
object at infinity at the wide angle end in the zoom lens according
to Embodiment 6. The zoom lens according to Embodiment 6 of the
present invention includes, in order from the object side, a first
lens unit having a positive refractive power that does not move for
zooming, a second lens unit having a negative refractive power that
moves during zooming, at least one lens unit that moves during
zooming, and a rear lens unit including an aperture stop.
The first lens unit U1 is a lens unit having a positive refractive
power that does not move for zooming. Moreover, the first lens unit
U1 includes a first sub lens unit U11 and a second sub lens unit
U12, and the second sub lens unit U12 that moves toward the object
side during focus adjustment from the object at infinity to the
object at close distance. The second lens unit U2 that moves during
zooming to play a role of zooming. The "at least one lens unit that
moves during zooming" in this Embodiment is a third lens unit U3
that moves during zooming to play a role of correcting the image
plane variation accompanying zooming. In this Embodiment, the rear
lens unit includes a fourth lens unit U4 (relay lens unit) that
does not move for zooming, includes the aperture stop SP, and has a
positive refractive power.
In Embodiment 6, the first lens unit U1 includes the first sub lens
unit U11 including a positive lens, a negative lens, and a positive
lens, and the second sub lens unit U12 including three positive
lenses that move during focus adjustment. The second lens unit U2
includes two negative lenses, a positive lens, a negative lens, and
a positive lens. The third lens unit U3 includes a cemented lens of
a negative lens and a positive lens, and a negative lens. The
fourth lens unit U4 includes two positive lenses, a cemented lens
of a negative lens and a positive lens, the aperture stop SP, a
positive lens, a cemented lens of a negative lens and a positive
lens, a cemented lens of a positive lens, a negative lens, and a
positive lens, a negative lens, and three cemented lenses of a
positive lens and a negative lens.
The zoom lens in Embodiment 6 attains a zoom ratio of 20.0.times.,
a half angle of field at the wide angle end of 28.4 degrees, and a
half angle of field at the telephoto end of 1.6 degrees.
Numerical Embodiment corresponding to Embodiment 6 is described in
<Numerical Embodiment 6> below.
FIGS. 12A, 12B, and 12C are longitudinal aberration diagrams when
the focus is at infinity at the wide angle end, a focal length of
180.00 mm, and the telephoto end, respectively, in the zoom lens
according to Embodiment 6. In the figures, the value of the focal
length is a value obtained when expressing Numerical Embodiment in
units of mm, and the same applies to Numerical Embodiments below.
In aberration diagrams, the spherical aberration is illustrated
with respect to the e-Line and the g-Line. The astigmatism is
illustrated on the meridional image plane (.DELTA.M) with respect
to the e-Line and on the sagittal image plane (.DELTA.S) with
respect to the e-Line. The lateral chromatic aberration is
expressed by the g-Line. In all of the aberration diagrams, the
spherical aberration, the astigmatism, the distortion, and the
lateral chromatic aberration are drawn on scales of 0.5 mm, 0.5 mm,
5%, and 0.05 mm, respectively. Symbol Fno represents the F-number,
and symbol .omega. represents the half angle of field. Note that,
the wide angle end and the telephoto end refer to the zoom
positions when the second lens unit U2 for zooming is located at
both ends of the range in which the second lens unit U2 is
mechanically movable on the optical axis.
Table 1 shows corresponding values of the conditional expressions
of Numerical Embodiment 6. Numerical Embodiment 6 satisfies all of
the conditional expressions (1) to (7). The zoom lens in this
Embodiment is small and lightweight despite being the zoom lens for
the large format camera, and attains the high zoom ratio with a
zoom ratio of 20.0.times., a half angle of field at the wide angle
end of 28.4 degrees, and a half angle of field at the telephoto end
of 1.6 degrees, and the high optical performance over the entire
zoom range from the wide angle end to the telephoto end.
Embodiment 7
In Embodiment 7, referring to FIG. 13, a brief description is given
of an image pickup apparatus (television camera system) using the
zoom lens according to each of Embodiments (Numerical Embodiments)
as a photographing optical system. FIG. 13 is a schematic diagram
of a main part of the image pickup apparatus according to the
present invention. In FIG. 13, an image pickup apparatus 125
includes a zoom lens 101 according to any one of Numerical
Embodiments 1 to 6, and a camera 124. The zoom lens 101 is
removably mounted to the camera 124. The image pickup apparatus 125
is constructed by mounting the zoom lens 101 to the camera 124.
The zoom lens 101 includes a first lens unit F, a zoom lens unit
LZ, and a rear lens unit R for imaging. The first lens unit F or
the zoom lens unit LZ includes a lens unit for focus adjustment.
The zoom lens unit LZ includes a lens unit that moves on the
optical axis for zooming and a lens unit that moves on the optical
axis for correcting the image plane variation accompanying zooming.
The rear lens unit R for imaging includes the aperture stop SP.
A lens unit IE that moves in the focal length range of the entire
system of the zoom lens 101.
Drive mechanisms 114 and 115, such as a helicoid and a cam, drive
the first lens unit F and the zoom lens unit LZ in an optical axis
direction, respectively. Motors (drive units) 116 to 118
electrically drive the drive mechanisms 114 and 115 and the
aperture stop SP. Detectors 119 to 121, such as an encoder, a
potentiometer, or a photo-sensor that detect positions of the first
lens unit F and the zoom lens unit LZ on the optical axis, and an
aperture diameter of the aperture stop SP. The camera 124 includes
a glass block 109, which corresponds to an optical filter or a
color separation prism provided within the camera 124. Further, the
camera 124 includes a solid state image pickup element
(photoelectric transducer) 110, such as a charge-coupled device
(CCD) sensor or a complementary metal-oxide semiconductor (CMOS)
sensor. The solid state image pickup element 110 that receives a
subject image formed by the zoom lens 101. Further, central
processing units (CPUs) 111 and 122 control the driving of the
camera 124 and the zoom lens 101.
By applying the zoom lens according to the present invention to a
television camera as described above, the image pickup apparatus
having the high optical performance may be realized.
Numerical Embodiment 1
TABLE-US-00001 Surface data Surface Effective number r d nd .nu.d
diameter 1 322.060 15.85 1.43387 95.1 144.38 2 -561.835 0.20 1
142.80 3 -1053.084 4.50 1.72916 54.7 141.67 4 150.529 1.17 1 138.78
5 150.029 23.11 1.43387 95.1 139.70 6 -872.351 0.20 1 139.89 7
167.827 16.77 1.43387 95.1 140.27 8 2068.554 0.20 1 139.60 9
136.426 14.91 1.43387 95.1 133.89 10 438.209 (Variable) 1 132.53
11* 632.290 1.50 1.53715 74.8 51.90 12 31.090 12.63 1 41.46 13
-49.863 1.50 1.53715 74.8 41.14 14 72.781 9.70 1 38.75 15 -31.818
1.50 1.53715 74.8 38.68 16 -179.190 0.50 1 41.60 17 86.827 7.04
1.65412 39.7 44.03 18* -71.085 (Variable) 1 44.17 19 183.198 7.12
1.51742 52.4 43.04 20 -62.377 0.20 1 43.13 21 -76.444 1.50 1.90200
25.1 42.81 22 851.985 0.20 1 43.35 23* 87.377 7.20 1.51742 52.4
43.94 24 -85.691 (Variable) 1 44.05 25 47.110 9.21 1.53715 74.8
40.20 26 -75.770 0.20 1 39.46 27* -161.231 1.50 1.77250 49.6 38.03
28 36.474 8.42 1.53715 74.8 35.50 29 -88.021 (Variable) 1 35.03 30
(Stop) .infin. 2.50 1 29.14 31 -3203.415 1.50 1.88300 40.8 27.29 32
33.206 7.00 1.59270 -35.3 25.76 33 -59.743 0.20 1 24.86 34 -341.630
1.50 1.88300 40.8 23.83 35 23.827 5.46 1.59270 35.3 22.22 36
214.783 0.90 1 21.50 37 255.490 1.50 1.88300 40.8 21.23 38 23.670
7.96 1.85478 24.8 20.46 39 -82.946 1.50 1.88300 40.8 20.25 40
69.429 0.20 1 20.42 41 51.937 7.06 1.85478 24.8 20.61 42 -52.719
1.50 1.88300 40.8 20.68 43 57.414 21.89 1 20.75 44 263.495 3.94
1.53172 48.8 28.76 45 -61.741 1.50 1.95906 17.5 29.12 46 192.038
0.20 1 30.14 47 62.143 6.68 1.53172 48.8 31.30 48 -46.182 1.50
1.95906 17.5 31.75 49 -64.474 1 32.54 Image plane .infin.
Aspherical surface data Eleventh surface K = 0.00000e+000 A4 =
2.87407e-006 A6 = -9.87572e-010 A8 = 2.85037e-012 A10 =
-4.14374e-015 A12 = 3.90023e-018 Eighteenth surface K =
0.00000e+000 A4 = 2.92304e-006 A6 = 1.18582e-009 A8 = -4.62922e-013
A10 = 1.31730e-015 A12 = -9.42211e-019 Twenty-third surface K =
0.00000e+000 A4 = -1.91661e-006 A6 = -4.52468e-010 A8 =
4.64191e-013 A10 = -1.09395e-015 A12 = 5.73853e-019 Twenty-seventh
surface K = 0.00000e+000 A4 = -1.73820e-006 A6 = 2.71278e-010 A8 =
2.02182e-012 A10 = -6.46061e-015 A12 = 6.25473e-018 Various data
Zoom ratio 20.00 Wide angle Intermediate Telephoto Focal length
40.00 180.00 800.01 F-number 4.60 5.36 5.60 Angle of field 28.42
6.86 1.55 Image height 21.65 21.65 21.65 Total lens length 455.50
455.50 455.50 BF 55.06 55.06 55.06 d10 2.00 98.90 151.82 d18 150.89
51.21 1.50 d24 24.24 14.85 17.13 d29 1.99 14.16 8.67 Entrance pupil
position 107.23 519.10 2512.83 Exit pupil position -62.78 -62.78
-62.78 Front principal point position 133.65 424.16 -2118.25 Rear
principal point position 15.06 -124.94 -744.95 Zoom lens unit data
Lens First Focal structure Front principal Rear principal Unit
surface length length point position point position 1 1 220.00
76.90 33.42 -20.78 2 11 -33.00 34.38 3.10 -30.02 3 19 100.00 16.22
7.40 -3.43 4 25 77.00 19.33 3.44 -9.65 5 30 -49.29 74.49 4.50
-58.66
Numerical Embodiment 2
TABLE-US-00002 Surface data Surface Effective number r d nd .nu.d
diameter 1 309.463 16.60 1.43387 95.1 154.77 2 -796.747 0.20 1
154.24 3 -3147.021 4.50 1.72916 54.7 153.21 4 153.581 0.29 1 148.91
5 152.879 25.01 1.43387 95.1 149.17 6 -1082.423 0.20 1 149.20 7
166.085 19.51 1.43387 95.1 148.33 8 1728.054 0.20 1 147.17 9
141.414 16.30 1.43387 95.1 139.79 10 469.895 (Variable) 1 137.94
11* 140.220 1.50 1.53715 74.8 53.82 12 35.668 12.40 1 45.60 13
-173.953 1.50 1.53715 74.8 42.36 14 98.820 7.67 1 39.65 15 -40.525
1.50 1.59522 67.7 39.27 16 59.876 0.19 1 39.89 17 48.642 5.52
1.72047 34.7 40.57 18* -1495.589 (Variable) 1 40.44 19 64.955 10.22
1.43875 94.9 52.76 20 -122.301 0.20 1 52.56 21 -171.372 1.70
2.00069 25.5 52.17 22 28261.585 0.20 1 52.09 23* 172.482 5.93
1.49700 81.5 52.02 24 -129.888 (Variable) 1 51.89 25 44.114 8.96
1.49700 81.5 41.51 26 -97.659 0.20 1 40.77 27* -310.687 1.50
1.77250 49.6 39.23 28 87.110 4.54 1.49700 81.5 37.40 29 -261.144
(Variable) 1 36.63 30 (Stop) .infin. 2.50 1 30.68 31 242.016 1.50
1.88300 40.8 28.2 32 23.168 7.96 1.59270 35.3 25.77 33 -69.912 2.68
1 24.75 34 107.234 1.50 1.88300 40.8 21.13 35 20.680 3.42 1.59270
35.3 19.36 36 63.981 (Variable) 1 18.63 37 -56.252 1.50 1.88300
40.8 17.34 38 41.889 0.19 1 17.00 39 32.689 7.69 1.85478 24.8 17.07
40 -26.389 1.50 1.88300 40.8 17.66 41 36.873 0.20 1 18.23 42 36.185
8.15 1.85478 24.8 18.43 43 -24.954 1.50 1.88300 40.8 19.12 44
48.974 (Variable) 1 19.77 45 63.097 9.88 1.53172 48.8 26.98 46
-32.051 1.50 1.95906 17.5 28.36 47 -103.359 0.20 1 29.93 48 70.421
11.48 1.53172 48.8 31.63 49 -30.910 1.50 1.95906 17.5 32.53 50
-54.654 1 33.90 Image plane .infin. Aspherical surface data
Eleventh surface K = 0.00000e+000 A4 = 5.19683e-007 A6 =
1.73681e-009 A8 = -1.50609e-012 A10 = 1.43359e-015 A12 =
1.52701e-019 Eighteenth surface K = 0.00000e+000 A4 = 2.12056e-006
A6 = 3.22748e-009 A8 = -4.68497e-012 A10 = 1.02585e-014 A12 =
-8.52497e-018 Twenty-third surface K = 0.00000e+000 A4 =
-1.18543e-006 A6 = -8.02896e-011 A8 = -8.20631e-014 A10 =
1.16608e-016 A12 = -6.41427e-020 Twenty-seventh surface K =
0.00000e+000 A4 = -1.70895e-006 A6 = 3.36974e-010 A8 =
-6.60188e-013 A10 = 1.19349e-015 A12 = -1.04914e-018 Various data
Zoom ratio 30.00 Wide angle Intermediate Telephoto Focal length
50.00 274.00 1500.08 F-number 4.60 5.53 9.82 Angle of field 23.41
4.52 0.83 Image height 21.65 21.65 21.65 Total lens length 491.04
491.04 491.04 BF 55.11 55.11 55.11 d10 7.38 107.00 140.37 d18
166.85 72.50 1.50 d24 34.64 18.19 65.96 d29 2.00 13.19 3.05 d36
3.85 6.90 12.65 d44 9.80 6.75 1.00 Entrance pupil position 139.06
842.29 5080.32 Exit pupil position -77.29 -69.39 -55.99 Front
principal point position 170.17 513.30 -13673.40 Rear principal
point position 5.11 -218.89 -1444.97 Zoom lens unit data Lens First
Focal structure Front principal Rear principal Unit surface length
length point position point position 1 1 215.00 82.80 32.99 -25.39
2 11 -30.50 30.29 10.33 -14.22 3 19 92.50 18.24 4.95 -7.75 4 25
80.00 15.20 0.96 -9.21 5 30 -63.66 19.57 10.42 -3.00 6 37 -30.09
20.74 6.19 -4.18 7 45 67.56 24.57 7.17 -9.40
Numerical Embodiment 3
TABLE-US-00003 Surface data Surface Effective number r d nd .nu.d
diameter 1 323.583 20.69 1.43387 95.1 154.53 2 -474.993 0.20 1
151.81 3 -548.786 4.50 1.72916 54.7 150.72 4 177.844 4.74 1 141.29
5 177.453 22.50 1.43387 95.1 141.41 6 -559.198 0.20 1 140.89 7
213.284 16.10 1.43387 95.1 137.41 8 -3234.199 0.20 1 136.58 9
153.517 14.92 1.43387 95.1 131.56 10 558.979 (Variable) 1 129.61
11* 391.648 1.50 1.53715 74.8 58.53 12 35.008 13.78 1 48.28 13
-76.088 1.50 1.53715 74.8 48.11 14 208.735 8.23 1 46.76 15 -45.774
1.50 1.53715 74.8 46.66 16 -175.487 0.50 1 48.45 17 116.939 6.28
1.80000 29.8 49.87 18* -316.657 (Variable) 1 49.76 19 137.482 8.29
1.51742 52.4 45.15 20 -60.464 0.63 1 45.33 21 -65.600 1.50 1.90200
25.1 45.02 22 -489.271 0.20 1 45.98 23* 108.086 6.81 1.51742 52.4
46.80 24 -102.805 (Variable) 1 47.00 25 44.079 12.04 1.53715 74.8
45.45 26 -86.609 0.20 1 44.12 27* -258.212 1.50 1.77250 49.6 41.86
28 33.953 9.60 1.53715 74.8 38.00 29 -101.992 (Variable) 1 37.33 30
(Stop) .infin. 2.50 1 27.69 31 -128.577 1.50 1.88300 40.8 26.30 32
29.387 6.38 1.59270 35.3 24.91 33 -43.762 0.20 1 24.61 34 -489.500
1.50 1.88300 40.8 23.38 35 -155.569 1.00 1.59270 35.3 22.99 36
27.201 3.44 1 22.45 37 775.668 1.50 1.88300 40.8 22.89 38 20.246
6.56 1.85478 24.8 23.92 39 -107.871 1.50 1.88300 40.8 24.35 40
113.856 0.20 1 24.98 41 29.221 6.75 1.85478 24.8 26.76 42 60.858
1.50 1.88300 40.8 25.92 43 33.922 19.54 1 25.47 44 39.993 12.31
1.53172 48.8 34.04 45 -34.383 1.50 1.95906 17.5 33.72 46 -170.719 1
34.66 Image plane .infin. Aspherical surface data Eleventh surface
K = 0.00000e+000 A4 = 1.34967e-006 A6 = -4.59445e-010 A6 =
5.39719e-014 A10 = 1.48200e-016 A12 = -4.446736e-020 Eighteenth
surface K = 0.00000e+000 A4 = 1.03240e-006 A6 = -5.48948e-011 A8 =
-7.61369e-014 A10 = 2.71026e-016 A12 = -1.43650e-019 Twenty-third
surface K = 0.00000e+000 A4 = -1.39189e-006 A6 = -2.09025e-010 A8 =
-7.86430e-013 A10 = 1.16795e-015 A12 = -9.06787e-019 Twenty-seventh
surface K = 0.00000e+000 A4 = -2.01409e-006 A6 = 5.39440e-010 A8 =
9.28833e-013 A10 = -2.69874e-015 A12 = 1.98395e-018 Various data
Zoom ratio 11.00 Wide angle Intermediate Telephoto Focal length
50.00 166.00 550.09 F-number 4.00 4.00 4.00 Angle of field 23.41
7.43 2.25 Image height 21.65 21.65 21.65 Total lens length 449.62
449.62 449.62 BF 49.91 49.91 49.91 d10 16.97 97.72 149.35 d18
139.31 57.30 6.46 d24 15.43 9.34 12.76 d29 2.00 9.35 5.14 Entrance
pupil position 154.03 508.75 1723.06 Exit pupil position -52.31
-52.31 -52.31 Front principal point position 179.58 405.18 -687.13
Rear principal point position -0.09 -116.09 -500.18 Zoom lens Unit
data Lens First Focal structure Front principal Rear principal Unit
surface length length point position point position 1 1 230.00
84.05 43.02 -17.19 2 11 -42.42 33.30 4.60 -24.61 3 19 100.00 17.43
6.78 -5.07 4 25 75.00 23.34 3.28 -12.58 5 30 -51.64 67.88 1.99
-50.39
Numerical Embodiment 4
TABLE-US-00004 Surface data Surface Effective number r d nd .nu.d
diameter 1 323.793 16.54 1.43387 95.1 142.87 2 -461.112 0.20 1
142.45 3 -897.246 4.50 1.72916 54.7 141.46 4 150.093 0.92 1 138.42
5 149.042 23.55 1.43387 95.1 139.19 6 -746.449 0.20 1 139.36 7
170.564 16.32 1.43387 95.1 139.35 8 2093.602 0.20 1 138.66 9
140.468 14.48 1.43387 95.1 133.05 10 466.164 (Variable) 1 131.70
11* 248.924 1.50 1.53715 74.8 35.97 12 30.699 10.17 1 31.49 13
-34.307 1.50 1.53715 74.8 29.39 14 73.732 7.15 1 28.62 15 -29.328
1.50 1.53715 74.8 28.67 16 2107.239 0.31 1 30.76 17 91.584 5.58
1.65412 39.7 32.35 18* -48.495 (Variable) 1 32.96 19 201.356 6.03
1.51742 52.4 40.56 20 -70.340 0.20 1 40.68 21 -73.507 1.50 1.90200
25.1 40.61 22 1122.574 0.20 1 41.32 23* 80.205 7.48 1.51742 52.4
42.15 24 -75.285 (Variable) 1 42.32 25 46.671 9.09 1.53715 74.8
39.63 26 -74.476 0.20 1 38.93 27* -143.645 1.50 1.77250 49.6 37.70
28 39.768 7.92 1.53715 74.8 35.49 29 -91.081 (Variable) 1 35.07 30
(Stop) .infin. 2.50 1 28.26 31 34080.822 1.50 1.88300 40.8 26.53 32
28.636 7.28 1.59270 35.3 24.99 33 -56.012 0.20 1 24.24 34 -431.425
1.50 1.88300 40.8 23.26 35 25.163 4.01 1.59270 35.3 21.87 36
151.721 11.70 1 21.45 37 317.930 1.50 1.88300 40.8 19.03 38 21.630
5.15 1.85478 24.8 19.07 39 -41.130 1.50 1.88300 40.8 19.12 40
58.737 0.20 1 19.23 41 43.001 4.03 1.85478 24.8 19.42 42 -42.770
1.50 1.88300 40.8 19.37 43 67.007 18.60 1 19.31 44 168.174 4.11
1.53172 48.8 23.44 45 -37.776 1.50 1.95906 17.5 23.62 46 654.970
0.20 1 24.39 47 62.647 5.66 1.53172 48.8 25.03 48 -32.484 1.50
1.95906 17.5 25.32 49 -48.204 1 26.02 Image plane .infin.
Aspherical surface data Eleventh surface K = 0.00000e+000 A4 =
3.65195e-006 A6 = 1.68193e-009 A8 = 4.43501e-012 A10 =
-2.24894e-015 A12 = 2.22720e-017 Eighteenth surface K =
0.00000e+000 A4 = 3.04324e-006 A6 = 3.13823e-009 A8 = 1.50868e-012
A10 = 1.41400e-015 A12 = -2.07204e-018 Twenty-third surface K =
00000e+000 A4 = -1.90927e-006 A6 = -2.34953e-010 A8 = 4.58990e-013
A10 = -1.10603e-015 A12 = 7.48446e-019 Twenty-seventh surface K =
0.00000e+000 A4 = -1.91675e-006 A6 = 2.70442e-010 A8 = 1.96888e-012
A10 = -6.13215e-015 A12 = 5.82002e-018 Various data Zoom ratio
20.00 Wide angle Intermediate Telephoto Focal length 40.00 180.00
800.05 F-number 4.60 5.30 5.60 Angle of field 20.30 4.70 1.06 Image
height 14.80 14.80 14.80 Total lens length 458.25 458.25 458.25 BF
55.08 55.08 55.08 d10 18.61 105.27 152.20 d18 142.85 52.38 5.93 d24
26.83 16.54 18.08 d29 1.99 16.09 14.07 Entrance pupil position
134.59 575.50 2678.02 Exit pupil position -72.59 -72.59 -72.59
Front principal point position 162.05 501.72 -1535.51 Rear
principal point position 15.08 -124.92 -744.97 Zoom lens unit data
Lens First Focal structure Front principal Rear principal Unit
surface length length point position point position 1 1 218.00
76.91 33.53 -20.70 2 11 -29.00 27.71 3.66 -22.45 3 19 100.00 15.41
7.67 -2.59 4 25 77.00 18.72 3.15 -9.49 5 30 -62.59 74.13 -1.66
-74.29
Numerical Embodiment 5
TABLE-US-00005 Surface data Surface Effective number r d nd .nu.d
diameter 1 338.492 13.36 1.43387 95.1 145.09 2 -1056.352 0.20 1
144.58 3 9766.859 4.50 1.72916 54.7 143.68 4 152.001 0.28 1 139.81
5 150.359 22.32 1.43387 95.1 140.08 6 -1220.081 0.20 1 140.04 7
162.878 16.33 1.43387 95.1 138.78 8 1342.727 0.20 1 138.01 9
146.736 13.34 1.43387 95.1 132.70 10 440.765 (Variable) 1 131.37
11* 540.975 1.50 1.53715 74.8 55.04 12 31.782 12.98 1 43.73 13
-60.783 1.50 1.49700 81.5 43.44 14 69.516 10.72 1 40.42 15 -31.884
1.50 1.49700 81.5 40.29 16 -235.525 0.20 1 43.17 17 86.044 6.51
1.65412 39.7 45.15 18* -94.646 (Variable) 1 45.23 19 -252.124 4.63
1.49700 81.5 41.72 20 -64.746 0.20 1 42.09 21 -68.342 1.50 1.80000
29.8 42.06 22 -147.364 0.20 1 42.88 23* 103.732 7.01 1.49700 81.5
43.69 24 -80.576 (Variable) 1 43.77 25 48.169 10.36 1.43875 94.9
39.51 26 -72.455 0.20 1 38.41 27* -216.225 1.50 1.77250 49.6 37.04
28 55.197 8.32 1.49700 81.5 35.50 29 -84.294 (Variable) 1 34.73 30
(Stop) .infin. 2.50 1 26.77 31 994.325 1.50 1.88300 40.8 25.01 32
30.855 5.29 1.59270 35.3 23.65 33 -76.667 3.38 1 23.08 34 658.519
1.50 1.88300 40.8 20.20 35 29.537 2.46 1.59270 35.3 19.13 36 49.517
(Variable) 1 18.61 37 -2522.380 1.50 1.88300 40.8 24.36 38 21.246
8.22 1.80000 29.8 25.19 39 -39.806 1.50 1.81600 46.6 25.64 40
42.560 0.30 1 26.97 41 39.767 8.32 1.80000 29.8 27.71 42 -26.870
1.50 1.81600 46.6 28.08 43 413.934 (Variable) 1 29.23 44 -479.321
4.06 1.53172 48.8 29.83 45 -47.418 1.50 1.95906 17.5 30.37 46
-317.270 0.20 1 31.74 47 85.998 7.74 1.53172 48.8 33.24 48 -35.508
1.50 1.95906 17.5 33.74 49 -48.932 1 34.87 Image plane .infin.
Aspherical surface data Eleventh surface K = 0.00000e+000 A4 =
2.19810e-006 A6 = -2.03032e-010 A8 = 1.21450e-013 A10 =
-2.76399e-016 A12 = 7.660668e-019 Eighteenth surface K =
0.00000e+000 A4 = 2.49248e-006 A6 = 9.08308e-010 A8 = -2.33699e-013
A10 = -1.57605e-016 A12 = 3.40961e-019 Twenty-third surface K =
0.00000e+000 A4 = -1.45934e-006 A6 = -1.88905e-010 A8 =
3.64285e-013 A10 = -7.88409e-016 A12 = 5.55245e-019 Twenty-seventh
surface K = 0.00000e+000 A4 = -1.75300e-006 A6 = -1.43359e-011 A8 =
1.63304e-012 A10 = -5.29419e-015 A12 = 5.33797e-018 Various data
Zoom ratio 20.00 Wide angle Intermediate Telephoto Focal length
40.00 180.00 800.08 F-number 4.60 5.26 5.60 Angle of field 28.42
6.86 1.55 Image height 21.65 21.65 21.65 Total lens length 455.67
455.67 455.67 BF 55.00 55.00 55.00 d10 2.00 98.12 151.95 d18 148.92
49.05 1.50 d24 31.95 20.89 21.44 d29 2.00 16.81 9.98 d36 5.21 6.91
22.28 d43 18.07 16.37 1.00 Entrance pupil position 105.80 523.39
2601.65 Exit pupil position -88.14 -87.24 -76.78 Front principal
point position 134.62 475.60 -1455.66 Rear principal point position
15.00 -125.00 -745.08 Zoom lens unit data Lens First Focal
structure Front principal Rear principal Unit surface length length
point position point position 1 1 223.00 70.72 27.97 -21.67 2 11
-32.70 34.91 4.59 -27.63 3 19 96.00 13.55 8.00 -0.96 4 25 83.00
20.38 4.82 -9.65 5 30 -45.70 16.62 10.01 -1.97 6 37 -166.63 21.34
3.54 -8.20 7 44 145.17 14.99 13.10 4.00
Numerical Embodiment 6
TABLE-US-00006 Surface data Surface Effective number r d nd .nu.d
diameter 1 525.150 17.98 1.43387 95.1 165.29 2 -386.921 0.20 1
164.23 3 -397.936 4.00 1.77250 49.6 163.82 4 256.224 4.16 1 157.89
5 259.750 21.27 1.43387 95.1 158.20 6 -531.172 11.90 1 157.77 7
281.361 16.54 1.43387 95.1 153.18 8 -1012.161 0.20 1 151.94 9
218.874 14.41 1.43387 95.1 143.52 10 3797.221 0.20 1 142.44 11
150.278 12.22 1.43387 95.1 134.60 12 340.920 (Variable) 1 132.75
13* 6640.105 1.20 1.77250 49.6 53.41 14 42.436 13.30 1 45.44 15
-44.708 1.20 1.53715 74.8 44.51 16 59.902 0.90 1 42.67 17 64.837
10.02 1.65412 39.7 42.76 18 -52.018 2.92 1 42.41 19 -34.694 1.20
1.53715 74.8 41.99 20 165.769 0.44 1 42.12 21 201.063 3.80 1.72047
34.7 42.15 22 -248.245 (Variable) 1 42.16 23 -93.960 1.20 1.59522
67.7 38.75 24 250.155 2.91 1.90200 25.1 39.87 25 -337.935 1.66 1
40.18 26 -99.190 1.20 1.72916 54.7 40.24 27 -1412.961 (Variable) 1
41.29 28 696.983 5.92 1.43875 94.9 43.21 29 -60.816 0.20 1 43.77
30* 107.225 3.82 1.60311 60.6 45.07 31 329.310 0.20 1 45.10 32
238.219 1.20 1.83400 37.2 45.14 33 178.775 3.43 1.49700 81.5 45.09
34 -503.903 0.99 1 45.11 35 (Stop) .infin. 1.00 1 45.08 36* 46.927
8.68 1.60311 60.6 44.93 37 1082.680 12.96 1 43.62 38 103.828 1.30
1.84666 23.8 33.71 39 27.869 5.03 1.48749 70.2 31.24 40 45.526 4.70
1 30.27 41 25.942 8.32 1.49700 81.5 29.16 42 -49.356 1.30 1.88300
40.8 28.20 43 24.054 6.64 1.64769 33.8 26.16 44 -67.743 11.46 1
25.94 45* 109.724 1.20 1.88300 40.8 23.59 46 18.867 0.33 1 22.48 47
19.373 11.85 1.69895 30.1 22.86 48 -13.841 1.20 1.83481 42.7 22.54
49 79.551 0.20 1 23.18 50 79.565 6.26 1.69895 30.1 23.26 51 -30.370
1.20 1.88300 40.8 23.60 52 89.347 21.16 1 24.39 53 58.746 11.06
1.62041 60.3 39.11 54 -35.731 1.20 1.84666 23.8 39.25 55 -96.770 1
40.36 Image plane .infin. Aspherical surface data Thirteenth
surface K = 8.73228e+003 A4 = 1.93552e-006 A6 = 7.30278e-010 A8 =
-4.11416e-012 A10 = 1.02033e-014 A12 = -2.67404e-018 A14 =
-1.44507e-020 A16 = 1.36217e-023 Thirtieth surface K = 2.34161e-001
A4 = -1.14955e-006 A6 = 7.61543e-011 A8 = -5.72777e-013 A10 =
4.16304e-016 A12 = -2.76724e-019 Thirty-sixth surface K =
2.58361e-001 A4 = 2.47940e-007 A6 = -3.26879e-011 A8 = 4.4347e-013
A10 = -2.51381e-016 A12 = 2.00540e-019 Forty-fifth surface K5 =
5.93347e+001 A4 = 8.01108e-007 A6 = -1.44279e-009 A8 = 3.36608e-011
A10 = -2.05140e-013 A12 = 5.44834e-016 Various data Zoom ratio
20.00 Wide angle Intermediate Telephoto Focal length 40.00 180.00
800.00 F-number 4.60 4.60 5.60 Angle of field 28.42 6.86 1.55 Image
height 21.65 21.65 21.65 Total lens length 473.71 473.71 473.71 BF
51.98 51.98 51.98 d12 0.99 97.17 136.44 d22 140.10 27.10 6.47 d27
2.81 19.64 1.00 Entrance pupil position 124.91 552.50 1711.87 Exit
pupil position -123.45 -123.45 -123.45 Front principal point
position 155.79 547.81 -1136.25 Rear principal point position 11.98
-128.02 -748.02 Zoom lens unit data First Focal Lensstructure Front
principal Rear principal Unit surface length length point position
point position 1 1 196.00 103.08 60.03 -14.99 2 13 -32.60 34.98
5.21 -21.42 3 23 -107.00 6.97 2.09 -2.49 4 28 52.13 132.80 -3.16
-134.91
TABLE-US-00007 TABLE 1 Values corresponding to the conditional
expressions in Numerical Embodiments 1 to 6 Conditional Conditional
Numerical Embodiment expression number Expression 1 2 3 4 5 6 fW
40.00 50.00 50.00 40.00 40.00 40.00 fT 800.01 1,500.08 550.09
800.05 800.08 800.00 f1 220.00 215.00 230.00 218.00 223.00 196.00
f2 -33.00 -30.50 -42.42 -29.00 -32.70 -32.60 .omega._W 28.42 23.41
23.41 20.30 28.42 28.42 .beta. 2w -0.20 -0.22 -0.29 -0.20 -0.20
-0.23 .beta. 2T -2.92 -3.63 -2.58 -2.33 -2.71 -4.82 L2W 150.89
166.85 139.31 142.85 148.92 140.10 LF 325.95 357.40 331.82 329.03
324.43 304.69 (1) f1/f2 -6.67 -7.05 -5.42 -7.52 -6.82 -6.01 (2)
f2/(2 .times. fW .times. tan(.omega._W)) -0.76 -0.70 -0.98 -0.98
-0.76 -0.75 (3) .beta. 2T/.beta. 2W 14.25 16.81 9.05 11.74 13.41
21.04 (4) fT/f1 3.64 6.98 2.39 3.67 3.59 4.08 (5) f2/L2W -0.22
-0.18 -0.30 -0.20 -0.22 -0.23 (6) LF/(2 .times. fW .times.
tan(.omega._W)) 7.53 8.26 7.66 11.12 7.49 7.04 (7) fT/(2 .times. fW
.times. tan(.omega._W)) 18.48 34.65 12.71 27.04 18.48 18.48
While the present invention has been described with reference to
exemplary embodiments, it is to be understood that the invention is
not limited to the disclosed exemplary embodiments. The scope of
the following claims is to be accorded the broadest interpretation
so as to encompass all such modifications and equivalent structures
and functions.
This application claims the benefit of Japanese Patent Application
No. 2014-094611, filed May 1, 2014, which is hereby incorporated by
reference herein in its entirety.
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